[ci skip] Add issue and pr template

CONTRIBUTING.md

@@ -42,7 +42,7 @@ If you find an issue, please do file it on the repository. The [Polymer/polymer
 
 For issues with elements the team maintains, please file directly on the element's repository. If you're not sure if a bug stems from the element or the library, air toward filing it on the element and we'll move the issue if necessary.
 
-We love examples for addressing issues - issues with a Plunkr, jsFiddle, or jsBin will be much easier for us to work on quickly. You can start with [this jsbin](https://jsbin.com/cijadomupa/1/edit?html,output) which sets up the basics to demonstrate a Polymer element.
+We love examples for addressing issues - issues with a Plunkr, jsFiddle, or jsBin will be much easier for us to work on quickly. You can start with [this jsbin](https://jsbin.com/xukike/edit?html,output) which sets up the basics to demonstrate a Polymer element.
 
 Occasionally we'll close issues if they appear stale or are too vague - please don't take this personally! Please feel free to re-open issues we've closed if there's something we've missed and they still need to be addressed.
 

issue_template.md

@@ -0,0 +1,28 @@
+### Description
+
+
+#### Live Demo
+https://jsbin.com/xukike/edit?html,output
+
+#### Steps to Reproduce
+1. …
+2. …
+3. …
+
+#### Expected Results
+
+
+#### Actual Results
+
+
+### Browsers Affected
+- [ ] Chrome
+- [ ] Firefox
+- [ ] Edge
+- [ ] Safari 9
+- [ ] Safari 8
+- [ ] IE 11
+
+### Versions
+- Polymer: vX.X.X (use `Polymer.version`)
+- webcomponents: vX.X.X (use `bower ls` or `npm ls`)

pull_request_template.md

@@ -0,0 +1,4 @@
+### Reference Issue
+Fixes #9999999
+
+### Description